Electro-dynamic transducer including a main magnetic circuit defining an air gap, a moving part comprising a dome shaped diaphragm and a movable coil fixed thereto and diving into the air gap; a support to which the moving part is suspended; and a suspension linking the moving part and the support; wherein the suspension is floating with respect of the support, allowing a radial degree of freedom. A method includes tunneling a packet from a first network device to a second network device associated with a first checking functionality. The at least one aligning key is attached to the base, and has at least a part thereof configured to laterally invade the receiving cavity. A driven unit is disposed in the developing unit main body and geared with the driving unit when the developing unit main body is mounted on the mounting frame. Various templates may be used to convert the second-order logic formula into the first-order logic formula.